// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_RENDERER_MEDIA_RENDER_MEDIA_CLIENT_H_
#define CONTENT_RENDERER_MEDIA_RENDER_MEDIA_CLIENT_H_

#include <memory>

#include "base/lazy_instance.h"
#include "base/macros.h"
#include "base/threading/thread_checker.h"
#include "base/time/tick_clock.h"
#include "base/time/time.h"
#include "content/common/content_export.h"
#include "media/base/media_client.h"
#include "widevine_cdm_version.h" // In SHARED_INTERMEDIATE_DIR.

namespace content {

class CONTENT_EXPORT RenderMediaClient : public media::MediaClient {
public:
    // Initialize RenderMediaClient and SetMediaClient(). Note that the instance
    // is not exposed because no content code needs to directly access it.
    static void Initialize();

    // MediaClient implementation.
    void AddKeySystemsInfoForUMA(
        std::vector<media::KeySystemInfoForUMA>* key_systems_info_for_uma) final;
    bool IsKeySystemsUpdateNeeded() final;
    void AddSupportedKeySystems(
        std::vector<std::unique_ptr<media::KeySystemProperties>>*
            key_systems_properties) final;
    void RecordRapporURL(const std::string& metric, const GURL& url) final;
    bool IsSupportedVideoConfig(media::VideoCodec codec,
        media::VideoCodecProfile profile,
        int level) override;

    void SetTickClockForTesting(std::unique_ptr<base::TickClock> tick_clock);

private:
    friend struct base::DefaultLazyInstanceTraits<RenderMediaClient>;

    RenderMediaClient();
    ~RenderMediaClient() override;

    // Makes sure all methods are called from the same thread.
    base::ThreadChecker thread_checker_;

    // Whether AddSupportedKeySystems() has ever been called.
    bool has_updated_;

    // Whether a future update is needed. For example, when some potentially
    // supported key systems are NOT supported yet. This could happen when the
    // required component for a key system is not yet available.
    bool is_update_needed_;

    base::TimeTicks last_update_time_ticks_;
    std::unique_ptr<base::TickClock> tick_clock_;

    DISALLOW_COPY_AND_ASSIGN(RenderMediaClient);
};

#if defined(UNIT_TEST)
// Helper function to access the RenderMediaClient instance. Used only by unit
// tests.
CONTENT_EXPORT RenderMediaClient* GetRenderMediaClientInstanceForTesting();
#endif

} // namespace content

#endif // CONTENT_RENDERER_MEDIA_RENDER_MEDIA_CLIENT_H_
